"Yamcha and Pu'ar" (ヤムチャとプーアル, Yamucha to Pūaru; Viz "Yamcha and Pu'ar") is the seventh chapter of Part I of the Dragon Ball manga.

Summary

While riding the speedboat, Bulma announces their journey to Frypan Mountain for the next Dragon Ball, much to the fear of Oolong due to the presence of Gyūmaō. Gokū dives in the river and attempts to recapture Oolong after the piglet shape-shifts into a fish in order to escape, motivating Bulma to remove her underwear to bait the shape-shifter into returning. While the piglet demands Bulma's "panties," she gives Oolong PP Candy, and promises to give him her underwear if he proves himself useful. Oolong later transforms into an oar that Gokū uses to push the speedboat across the river when it runs out of gasoline.

On shore, Bulma panics in frustration when she attempts to use her Hoi Poi Capsules for transportation on land and realizes she dropped them in the river. Gokū suggests to Bulma to have Oolong transform into a bike, only to find out the piglet escaped again. Bulma counters this by saying "Pii Pii," which activates the PP Candy she gave to Oolong to act a laxative to increase his bowel movements as assurance that the piglet will not betray them again. Oolong is forced to transform into a motorcycle, but this method of transportation proves to be ineffective as the bike breaks down, leading Oolong to further explain that his transformation ability only allows him to alter his appearance, but not his power. Oolong then transforms into a pair of underwear to replace the one Bulma used to bait him, much to Bulma's anger.

Gokū eventually offers to walk with Bulma and Oolong through a desert. Unlike Gokū, this walk causes Bulma and Oolong to gasp in exhaustion, leading the woman to complain in frustration and then succumb to slumber. As Oolong and Gokū decide to recuperate as well, a cat by the name of Pu'ar watches them with a telescope from a shelter not far from Gokū's location. Pu'ar apprises his fellow bandit Yamcha of Gokū and Oolong's appearance in the desert, causing the thieves to approach the two and gain their attention as they close in on the boy and the piglet in order to steal from them.